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Use interators instead of counters for loops.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-07-08 20:57:27 +00:00
parent 3046470919
commit 058a024eb7
1 changed files with 21 additions and 16 deletions
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37
lib/CodeGen/PrologEpilogInserter.cpp
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@ -163,25 +163,27 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
FFI->setHasCalls(HasCalls);
FFI->setMaxCallFrameSize(MaxCallFrameSize);
for (unsigned i = 0, e = FrameSDOps.size(); i != e; ++i) {
MachineBasicBlock::iterator I = FrameSDOps[i];
// If call frames are not being included as part of the stack frame,
// and there is no dynamic allocation (therefore referencing frame slots
// off sp), leave the pseudo ops alone. We'll eliminate them later.
for (std::vector<MachineBasicBlock::iterator>::iterator
i = FrameSDOps.begin(), e = FrameSDOps.end(); i != e; ++i) {
MachineBasicBlock::iterator I = *i;
// If call frames are not being included as part of the stack frame, and
// there is no dynamic allocation (therefore referencing frame slots off
// sp), leave the pseudo ops alone. We'll eliminate them later.
if (RegInfo->hasReservedCallFrame(Fn) || RegInfo->hasFP(Fn))
RegInfo->eliminateCallFramePseudoInstr(Fn, *I->getParent(), I);
}
// Now figure out which *callee saved* registers are modified by the current
// function, thus needing to be saved and restored in the prolog/epilog.
//
const TargetRegisterClass* const *CSRegClasses =
const TargetRegisterClass * const *CSRegClasses =
RegInfo->getCalleeSavedRegClasses(&Fn);
std::vector<CalleeSavedInfo> CSI;
for (unsigned i = 0; CSRegs[i]; ++i) {
unsigned Reg = CSRegs[i];
if (Fn.getRegInfo().isPhysRegUsed(Reg)) {
// If the reg is modified, save it!
// If the reg is modified, save it!
CSI.push_back(CalleeSavedInfo(Reg, CSRegClasses[i]));
} else {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
@ -203,9 +205,10 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
// Now that we know which registers need to be saved and restored, allocate
// stack slots for them.
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
const TargetRegisterClass *RC = CSI[i].getRegClass();
for (std::vector<CalleeSavedInfo>::iterator
I = CSI.begin(), E = CSI.end(); I != E; ++I) {
unsigned Reg = I->getReg();
const TargetRegisterClass *RC = I->getRegClass();
// Check to see if this physreg must be spilled to a particular stack slot
// on this target.
@ -215,13 +218,14 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
++FixedSlot;
int FrameIdx;
if (FixedSlot == FixedSpillSlots+NumFixedSpillSlots) {
if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) {
// Nope, just spill it anywhere convenient.
unsigned Align = RC->getAlignment();
unsigned StackAlign = TFI->getStackAlignment();
// We may not be able to sastify the desired alignment specification of
// the TargetRegisterClass if the stack alignment is smaller.
// Use the min.
// We may not be able to satisfy the desired alignment specification of
// the TargetRegisterClass if the stack alignment is smaller. Use the
// min.
Align = std::min(Align, StackAlign);
FrameIdx = FFI->CreateStackObject(RC->getSize(), Align);
if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
@ -230,7 +234,8 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
// Spill it to the stack where we must.
FrameIdx = FFI->CreateFixedObject(RC->getSize(), FixedSlot->second);
}
CSI[i].setFrameIdx(FrameIdx);
I->setFrameIdx(FrameIdx);
}
FFI->setCalleeSavedInfo(CSI);